EDIT: My sincere apologies: my mice and my touchpad appear to be malfunctioning. I cannot find a way to delete this issue; feel free do to so.

On right clicking to open a chest, there appears to be another right click that occurs immediately afterward within the chest GUI. Any item stack in the slot where the cursor appears after opening the chest is halved, as if you pressed right click again without moving the mouse (pictures attached). This requires you to first drop the item back for normal chest use.

This occurs 70% of the time (20 tests).

The first picture is what should happen on opening a chest. The second is what happens immediately after right clicking the chest when the bug occurs.

Steps to Reproduce:
Fill chest with items. Open chest.